| ZrO2의 고분자화 분산법을 이용한 Al2O3/ZrO2요업체의 제조 |
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| Fabrication of Al2O3/ZrO2Ceramics by the Polymerization Dispersion Process |
| Myung-Je Cho, Kyu-Hong Hwang1, Jong-Kook Lee2 |
Engineering Research Institute, Gyeongsang National University
1Engineering Research Institute, Gyeongsang National Universit
2Division of Metallurgical and Material Engineering, Chosun University |
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| ABSTRACT |
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To improve mechanical properties of $Al_2$O$_3$/ZrO$_2$composites have been controlled dispersion of ultra low size ZrO$_2$ particles in $Al_2$O$_3$ ceramics by polymeric precursor method (Pechini process). In case of coprecipitation or mechanical mixing of ZrO$_2$ powders with $Al_2$O$_3$, homogeneous dispersion and controlling the ZrO$_2$ size were relatively difficult due to high sintering temperature. So the polyesterization process of Zr/Y(NO$_3$)$_3$-citric acid solution in ethylene glycol with the commercial sub-micron sized o(-alumina powder (Sumitomo AES-11(0.4 ${mu}{textrm}{m}$)) was adopted in order to obtain homogeneous dispersion of ZrO$_2$ in A1203. By this partial polyesterization process, the homogeneous dispersion of relatively low sized ZrO$_2$in $Al_2$O$_3$/ZrO$_2$composites was achieved at 1450∼1$600^{circ}C$ of sintering temperature range and their mechanical properties were measured. |
| Key words:
$Al_2$$O_3$/$ZrO_2$composites, Pechini process, Polyesterization, Mechanical properties |
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